11923840 has 64 divisors (see below), whose sum is σ = 29473920. Its totient is φ = 4608000.

The previous prime is 11923831. The next prime is 11923861. The reversal of 11923840 is 4832911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 11923799 and 11923808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19540 + ... + 20140.

It is an arithmetic number, because the mean of its divisors is an integer number (460530).

Almost surely, 2^11923840 is an apocalyptic number.

11923840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14736960).

11923840 is an abundant number, since it is smaller than the sum of its proper divisors (17550080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11923840 is an equidigital number, since it uses as much as digits as its factorization.

11923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 11923840 is about 3453.0913686145. The cubic root of 11923840 is about 228.4574789164.

The spelling of 11923840 in words is "eleven million, nine hundred twenty-three thousand, eight hundred forty".